天然气黏度精确计算新模型  

A new model for the accurate calculation of natural gas viscosity

作　　者：杨晓鸿[1] 张顺喜[1] 朱薇玲[1] Yang Xiaohong Zhang Shunxi Zhu Weiling(School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei 430023, Chin)

机构地区：[1]武汉轻工大学化学与环境工程学院

出　　处：《天然气工业》2016年第12期113-118,共6页Natural Gas Industry

摘　　要：天然气黏度是基础而重要的参数,在天然气开采、输送和加工等领域有着重要的理论和应用价值。为了高效、低成本地获得精确的天然气黏度数据,基于气体分子运动论所得黏度、温度和密度关系,建立了计算天然气黏度的新模型和相应的函数关系式,用大量的实验数据对模型参数进行优化后,给出了天然气黏度随温度和密度的变化曲面图。研究结果表明：（1）天然气黏度随密度以及低密度区域温度的升高而升高;（2）天然气黏度在高密度区域随温度的升高而降低。新模型精确地预测了9个天然气样本的黏度数据,其计算值与1 539个处于250-450 K、0.1-140.0 MPa区间的实验数据相比,平均相对偏差不超过1.9%;其中,与测量误差小于0.5%的793个实验数据相比,最大相对偏差不超过0.98%。结论认为,与以前的8种计算模型相比,新模型具有方法简单、结果精确、计算快速、可直接计算含有二氧化碳天然气样本的优点。Viscosity of natural gas is a basic and important parameter, and it is of theoretical and practical significance in the sectors of natural gas recovery, transmission and processing. For obtaining the accurate data of viscosity efficiently at a low cost, a new model and its corresponding functional relation were developed based on the relationship among viscosity, temperature and density derived from the kinetic theory of gas. After the model parameters were optimized using sufficient experimental data, the diagram showing the vari- ation of viscosity along with temperature and density was prepared. It is shown that the viscosity increases with the increase of density. Furthermore, with the increase of temperature, the viscosity increases in low density regions, but decreases in high density regions. With this new model, the viscosity of 9 natural gas samples was calculated precisely. The average relative deviation between these calculated values and 1 539 experimental data which were measured under 250-450 K and 0.1-140.0 MPa is less than 1.9%. Compared with the 793 experimental data with a measurement error less than 0.5%, the maximum relative deviation is less than 0.98%. It is concluded that this new model is more advantageous than the previous 8 models in terms of simplicity, accuracy, fast calculation, and direct applicability to the CO2 bearing gas samples.

关 键 词：天然气 黏度 新模型 温度 密度 组成 气体分子运动论 相对偏差 精确计算 

分 类 号：TE642[石油与天然气工程—油气加工工程]